Ramming were considered a viable ASW tactic back then and while the specifics elude me, I distinctly remember it being done successfully in both wars.
Even merchant ships used these tactics, the RMS Olympic sinking a German U-boat in WW1, ramming U-103 on the 18 May 1918.
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Thank you Kim for the crest
"Never fear to try on something new. Remember that the Titanic was built by professionals, and the Ark by an amateur"