Wrote Dahlgren, who has serious apprehensions about Laird's ironclad steamers, which troubled Du Pont, that I thought he might feel assured they would not disturb him. Seward says Mr. Adams has made a vigorous protest, and informed the British Government if the Rebel ironclads are permitted to come out it will be casus belli. If he has taken that position, which I have always urged, and we persist in it, all will be well.
SOURCE: Gideon Welles, Diary of Gideon Welles, Secretary of the Navy Under Lincoln and Johnson, Vol. 1: 1861 – March 30, 1864, p. 406