Official Records (Army), Series 3 - Volume 2, p. 82:

NORWICH, May 27, 1862.
Hon. E. M. STANTON Secretary of War:
The Krupp cannon was forwarded to-day. I can send you for ninety days a battery of artillery with 130 men, 6-pounder cannon and 12-pounder howitzers, caissons, battery wagon, forges, and all appointments new and complete, except horses, which can be furnished at short notice. Several companies of militia tender their services for ninety days.
Respectfully, WM. A. BUCKINGHAM, Governor of Connecticut.

WAR DEPARTMENT, Washington City, D. C., May 27, 1862.
Governor BUCKINGHAM, Norwich, Conn.:
Accept my thanks for the Krupp cannon. I think we shall not need any three-months men or artillery, but will let you know if they should be needed.
EDWIN M. STANTON, Secretary of War.

In addition I have run onto references (now mislaid) of Krupps being imported by Philadelphians.

John