...smounted, spiked, and otherwise rendered ineffective. Too much praise cannot be awarded to Capt. McGrath, when commanding the guns, for the skilful manner in which he manned them. A detachment of Fremont 's, more familiarly known as jackass guns, were taken to the Heights during the day, and rendered valuable assistance. They were manned by company I, Twelfth regiment New-York State militia. Col. F...