The youngest of the illegitimate children of Sir Edward Poynings, he played a prominent role in the defence of the English garrison at Le Havre in 1562–63.
His brother, Edward, captain of the guard at Boulogne, was killed in action in January, and replaced by Thomas Wyatt, whose lieutenant Poynings became in February.
"[13] In late November 1562, Sir Hugh Paulet replaced Poynings at Newhaven, although he continued to serve on the military council.
In 1567, Poynings unsuccessfully claimed the other title held by the West family, the barony of De La Warr, in right of his wife.
[15][16][17][12] Poynings' final years were spent as captain at Portsmouth, where he is said to have quarrelled with the mayor and burgesses, 'who accused him of high-handedness and violence'.