Under Macintyre, Walker and her group were often called on to reinforce Tribal-class destroyers escorting battleships and other capital ships. The assignment supplied extra destroyers to a larger screen. Walker also appears repeatedly in exercises testing methods of finding and attacking submarines. Her work therefore included developing techniques as well as applying them on operational escorts.
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Walker as an additional escort and ASW exercise ship
Walker reinforced Tribal-class escort groups and repeatedly joined exercises testing submarine-hunting methods.