The raiding ship CSS "Alabama", built in the British port of Birkenhead, was another difficulty for Palmerston. On 29 July 1862, a law officer's report he had commissioned advised him to detain "Alabama", as its construction was a breach of Britain's neutrality. Palmerston ordered "Alabama" detained on 31 July, but it had already put to sea before the order reached Birkenhead. In her subsequent cruise, "Alabama" captured or destroyed many Union merchant ships, as did other raiders fitted out in Britain. The U.S. accused Britain of complicity in the construction of the raiders. This was the basis of the postwar "Alabama" claims for damages against Britain, which Palmerston refused to pay. After his death, Gladstone acknowledged the U.S. claim and agreed to arbitration, paying out $15,500,000 in damages.