A hammer and a sack against a submarine?

Do you think the loss of troops is the end? Captain, during World War I, sailors left without the support of submarines used crazy tactics. Late at night, a smith and a few artillerists would get on a raft to carry out a cunning plan… Once they noticed a periscope, they would quietly get close to it and wrap a bag around it or simply smash it with a hammer thus rendering the submarine ‘‘blind’’. The submarine would then be forced to rise to the surface, where the artillerists were waiting for it.

Do you agree that losing troops is no big deal for a true warrior?