...ast the perils of the keg cannon. General Warren has a short leave, and General Crawford commands the Corps, to the indignation, I presume, of old cocks like Griffin and Ayres; for C. was doctor in Fort Sumter , and thus got a star, and thus is an old brigadier, and thus ranks the regulars G. and A. General Grant was on a flying visit to Washington to-day. I like to have him down here: first, he gives a g...