Upon deployment with the flotilla, Teazer underwent working up exercises in Scapa Flow before sailing for the Mediterranean theatre, where, in November, she supported ground operations by the British X Corps in the Minturno sector.

In July 1944, she was placed under U.S. Navy command and was one of the ships scheduled to support the landing in the South of France as part of Operation Dragoon.

During the Allied withdrawal form the Aegean Sea in 1944, Teazer was responsible for the sinking of the transport ship KT Erpel and the submarine chaser UJ2171 off Cape Spatha.

Between 1953 and 1954, she was converted into a Type 16 fast anti-submarine frigate, by Mountstuart Dry Docks, Cardiff, with the new pennant number F23[1] In January 1959, she replaced Grenville in the 2nd Training Squadron.

In July that year, she had recently left England, bound for the West Indies, leaving Jackson seconded to a shore posting and very disappointed.