...ition of chief engineer of this. The general instructions did not differ essentially from those given to General Butler. In them, Terry was informed that a siege train would be at his disposal at Fortress Monroe , if he should require it, to consist, as he was told by the Lieutenant-General, of twenty 30-pounder Parrott guns, four 100-pounder Parrotts, and twenty Cohorn mortars, with a sufficient number of ar...