but finally the union generals, instead of calling for more troops, got after general jackson, and he fled from the shenandoah valley, burning the bridges behind him. it is said that as he and his staff were about to cross their last bridge they saw a mounted gun on the opposite side, manned by a union artilleryman. jackson rode up and in clarion tones called out, "who told you to put that gun there, sir? bring it over here, sir, and mount it, and report at head-quarters this evening, sir!"