...of one of the lower hill batteries, and was endeavoring to remount his guns, and had mounted a twelve-pounder field-piece to fire on General McArthur's troops, which had landed a short time before at Warrenton . I sent the Mound City and Carondelet to drive him off, which they did in a few moments. I beg leave to inclose a letter from General McArthur, explaining why he did (to use his own expression)...