He (Patton) rammed a submachine gun into the belly of a soldier collapsed from exhaustion on a North African beach, waking him suddenly to his explanation.

I know you’re tired. We’re all tired. That makes no difference. The next beach you land on will be defended by Germans. I don’t want one of them coming up behind you and hitting you over the head with a sockful of shit.

That “sockful of shit” brought reality home more certainly than any other weapon he could have mentioned.

From ‘The American Tradition‘ by John Greenway

From the always interesting Military Motivators.