How many Tribals would screen a capital ship?

How many Tribal-class destroyers would normally be assigned to escort a capital ship such as Hood?

Usually a half-flotilla of about four, sometimes reinforced by a leader, a full flotilla, or another destroyer half-flotilla when several capital ships were present.

Four Tribals, a half-flotilla, were the normal starting point for screening a ship such as Hood. A flotilla leader or another accompanying destroyer could raise the immediate group to five. If Prince of Wales or another major unit also needed protection, the navy would seek a full flotilla when possible. An alternative was to combine a Tribal half-flotilla with four destroyers of another class, showing how escort composition followed both availability and the value of the force being protected.