Hi Matthew,
I don't have any info on Thomas English, but I have a very lengthy bit of info on Richard. It comes from a book called Old Guard in Gray by J. Harvey Mathes. Hope it's of some use to you.

English, Richard T., joined the Confederate Relief and Historical Assoc. July 1, 1869, and died in this city (Memphis) October 13, 1871. He was a man of noble impulses and universally popular in all circles. He resided in this city for six years previous to his death, and it may be safely asserted that he had more genuine friends than most newspaper workers among all the list, being liked not only by his personal intimates, but also by those who served opposition journals. Captain English was a native of Chester County, Pa.; born July 4, 1832; attended college in Wisconsin and removed to Natchez, MS, with his father and family in 1852. He was there engaged in civil engineering until the war began. In April, 1861, he was third lieutenant of the Quitman Artillery, and three months later was unanimously chosen its Captain. Served a year at Mobile and Pensacola under General Bragg, then raised a battery of light artillery at Natchez, MS. At Port Hudson Captain English was appointed provost marshal, but he operated his battery in all of the engagements about that place until he was captured in 1863, when he was sent to Camp Chase, Ohio. Before his capture he had been promoted to a lieutenant-colonel of artillery and was on his way to serve under Kirby Smith when taken prisoner. One of his daring exploits was to place his battery on the bluffs at Ellis Cliffs, some twenty miles below Natchez, to fire on passing war ships compelled to move close along shore, owing to the nature of the river channel. On one occasion he used a Maynard rifle while in ambush half way down the side of the cliff to fire upon an officer occupying the quarter deck of a big ship, supposing it to be Commodore Farragut, as he wore a red sash of command at the time. The officer was hit and fell from the chair upon which he was seated. A broadside from the ship sent cannon shot and shell into the bluff at the feet of Captain English, which seemingly raised the side of the cliff as if a mine had been sprung. When Captain English died his funeral was attended by the Masonic brotherhood, of which he was a worthy member. Few can count upon as many and as lasting friendships as Captain English. His sense of honor was the highest. He was incapable of selfishness and in his intercourse with all, his manners were most genial, prompted by a heart filled to overflowing with the milk of human kindness.