Hello Alice, your correct about the other units however I would take an issue with some of the information on Wikipedia. The following is what Wikipedia had to say about the 3rd Maryland Cavalry.

"3rd Maryland Cavalry
The service of the 3rd Regiment Cavalry, Maryland Volunteers began on August 8, 1864, with the raising of three companies at Baltimore. In September and October, Companies D, E, F, and G were recruited from Confederate prisoners at Fort Delaware, most of whom had been captured at the Battle of Gettysburg, numbering approximately 450 in all. The regiment remained in garrison at Camp Schenck in Baltimore, seeking to raise more troops, assigned to the Cavalry Reserve of the Eighth Corps until officially organized on January 9, 1864. Sent by steamship to New Orleans and Madisonville, Louisiana, the 3rd Maryland Cavalry took part in the Red River Campaign, in the Atchafalaya Expedition in the first week of June 1864,[n 21] was dismounted and participated in the siege of Fort Morgan in August. Disease seriously depleted the ranks of the regiment, and in December 1864 the 3rd Maryland Cavalry consolidated into a six-company battalion. Company D became part of Company E, and Company G part of Company F, participating in the campaign to capture Mobile, Alabama in March and April 1865.[28] The 3rd Maryland Cavalry was the only unit of "galvanized Yankees" in Federal service to actively campaign against Confederate forces. At the end of hostilities it was assigned to the Department of Mississippi and garrisoned Natchez, Mississippi through the summer of 1865. The battalion mustered out at Vicksburg on September 7, 1865"

I've been doing research on galvanized Yankees for almost a year now and have done short biographies of all members of Companies D,E,F, and G. of the 3rd Maryland Cavalry and some work on the 1st Connecticut Cavalry and other areas. The work will be donated to the Fort Delaware Society and should be released hopefully in the near future. The first former Confederates in the 3rd Maryland Cavalry became members of Company H and they remained in Company H, it's odd that somehow these galvanized Yankees were over looked. Having said this perhaps only 12 to 15 former Confederates were in company H and they became Union soldiers in August of 1863. They were enlisted at Fort McHenry and not at Fort Delaware as were companies D,E,F and G. All were mustered in at Baltimore, Maryland.

I admit I'm being picky when Wikipedia made this statement..........."most of whom had been captured at the Battle of Gettysburg, numbering approximately 450 in all." We know the battle of Gettysburg was fought July 1st through 3rd of 1863. I would disagree with that statement. However if they would have said the Gettysburg Campaign generally accepted as June 3, 1863 to July 24th 1863 then I would totally agree. I also disagree with Wikipedia's approximately 450 former Confederates in all. They are off in my opinion by a substantial amount.

Another point Wikipedia made was that Company D went to E and G to F during the regimental reorganization which took place on December 9th 1864. We can say that Companies D and G were eliminated within the 3rd Maryland Cavalry and many of its members did go to Companies E and F but so too did they go into companies H and K. Wikipedia also stated that "Disease seriously depleted the ranks of the regiment" That would be a hard case to argue against since disease claimed so many lives in the war however in this case perhaps less than 30 galvanized Yankees lost their lives during the war within the 3rd MD CAV and if you subtract those who accidently shot themselves and died and those who were killed because a tree fell upon them and those who were lost at sea (fell over board) and for other off the wall deaths the galvanized Yankees in the 3rd Maryland Cavalry did not lose that many soldiers due to disease as compared to other Union regiments in the region. Perhaps one reason may have been because most of them had lived in the South prior to the war, not that the Confederates did not die of disease themselves because they did. Just guessing I would say no more than 15 galvanized soldiers in the 3rd Maryland Cavalry died of disease during the war. What did seriously deplete their ranks of the galvanized battalion were their desertions. The majority of them would desert at least one time during their service to the 3rd Maryland Cavalry. This may or may not have been an under lying issue for General Grant to move the former Confederates out West in 1864. There was at least one case where a galvanized Yankee in the 3rd Maryland Cavalry deserted because he said he did not want to fight against his former comrades. They put him if I remember right at Fort McHenry and then moved him to Camp Distribution in Alexandria, Virginia. Camp Distribution was sort of like a boot camp for Union deserters "a let's start this process all over again routine" After Alexandria he still did not want to rejoin the 3rd Maryland Cavalry but he did say he would join the Union army if they transferred him to Minnesota. I believe he had numerous desertions within the 3rd MD CAV by then. I want to say it was General Dix who allowed him to be transferred to Minnesota and when he arrived at Fort Ridgely, Minnesota he promptly deserted. The Provost Marshal in Baltimore was outraged and demanded his immediate arrest but as I recall he was never heard from again.
Another small issue with Wikipedia concerning the 3rd Maryland Cavalry is when they stated they were discharged on September 7, 1865. Some of them were discharged on September 5th and others on September 7th at Vicksburg, Mississippi. I thought at first that it may have been caused because of a Sunday but September 5th 1865 was a Tuesday and of course the 7th was on a Thursday. The only explanation I can think of is when they left Natchez for Vicksburg the transport may not have had enough room for all of them. If we think back to the Sultana disaster which occurred in late April of 1865 because of over loading and against spring rains the steamer to Vicksburg may have played it safe. The horses by the way were left at Fort Adams at Natchez and did not make the trip to Vicksburg however the horses did make the trip from Baltimore to Louisiana with the various companies. When the galvanized battalion left Baltimore the companies left on separate transports save two companies who took the same transport. Lieutenant Colonel Tevis started organizing the 3rd Maryland Cavalry in July of 1863 although he was not made their official Colonel until January 7, 1864. The galvanized Yankees in Companies D, E, F and G were all organized and mustered into service in September of 1863. None were done so in October 1863 as Wikipedia stated according to my research finds.

All in all Wikipedia did a fairly good job overall describing what happened with the 3rd Maryland Cavalry. In other areas of the context Wikipedia seems to believe that the term galvanized Yankees was first used in at newspaper in Minnesota if I remember correctly. In fact it was noticed in a clerk's diary at Fort Delaware in 1863. Perhaps it was just a coincidence but I rather believe the term had been used prior to 1864.

I guess it's about time to quit nit-picking at Wikipedia. The 3rd Maryland Cavalry has a rich and fascinating history. The Captain of Company E was Andrew J. Pemberton, the younger brother of the famous Vicksburg defender Lieutenant General John Clifford Pemberton. 1st Lieutenant Andrew J. Pemberton had been a recruiting officer for Company E of the 3rd Maryland Cavalry. I would have loved to have been a fly on that wall listening to Pemberton trying to convince former Confederates to join the Federal side. He may have started off with "You may have heard of my brother General Pemberton at Vicksburg? He too chose the wrong side but you can right your wrongs by joining the Union army today" There is no evidence whatsoever that he ever mentioned his brother but rather my imagination getting the better of me. From reading letters by Colonel Tevis he was not a big fan of Captain Pemberton. I don't think he had anything personally against him rather his lack of discipline among his company. One issue was desertions. One of Captain Pemberton's men as an example deserted and then ordered a boy in Baltimore to say hurrah for Jefferson Davis. The boy refused and picked up a stone and hit the galvanized Yankee in the head as witnessed by at least one Federal officer. The deserter was arrested an imprisoned. In those days just saying hurrah for Jefferson Davis could land you in jail let alone ordering a boy to say it. To make matters worse when the trial took place before the boy could testify the galvanized Yankee grabbed a knife and almost killed the lad with a thrust near the heart. Now the galvanized Yankee was charged with attempted murder and taken to Fort McHenry in chains. The news spread quickly and soon made the local newspapers. As we know stuff goes downhill and the Provost Marshal told Lt.Col.Tevis and Tevis told Pemberton and Captain Pemberton soon ask to be relieved of duty after arriving in Louisiana. That event was not out of the ordinary within the galvanized Yankees of the 3rd Maryland Cavalry. They were stabbing civilians and at least one murder if I remember right and they were stabbing each other. Only one member of the 3rd Maryland Cavalry however would meet his fate at the hands of a firing squad as the result of an attempted murder which is not the same case noted above. And of course there were the comedians within the galvanized 3rd MD CAV. One man would continually desert and turn himself in the next day. But during the night he would yell the order "drinks are on the house!" in an open saloon in Baltimore. As soon as the drinks were gone so was he without paying for them. And after a short time in confinement he would desert again but not to the bars as they had been warned about him. This time he went off to a rather nice restaurant and ordered oysters for everyone at .75 cents per dozen. Of course he did not have any money at that time either. The third time if I remember correctly he went to a house of ill fame and I don't have to comment about that. He just had a knack for getting stuff in advance. No doubt the merchants of Baltimore were happy when he left with his company to Louisiana. I don't want to paint the galvanized Yankees into a poor light they were just an ordinary Union battalion whose soldiers happened to be the opposing enemies at one time. There were some find men within the galvanized battalion of the 3rd MD CAV also. I guess it's just human nature to point out the bad issues instead of the good. Sort of like television news today. Very little good news mostly bad news gets the coverage. A lot of them went unnoticed throughout the war and just did their duty as they saw fit. Colonel Tevis was a West Point grad and a very aggressive and smart leader in my opinion. He would be promoted to General before the end of the war and his second in command Lieutenant Colonel Kirby would take over the command of the 3rd Maryland Cavalry. After the war General Tevis went to France as a private citizen and fought in various conflicts and at one time was made a prisoner but escaped. He died in 1900 I believe and is buried in Paris, France.