Even though the Confederacy had "officially" ended their relationship with firm by mid-1863, the Isaac brothers still managed to sell various wares to the south during 1864 through the use of front men who offered items made by Isaac's factories. With the Confederate defeat at the end of the war, the company soon began to deteriorate, with many outstanding debts still owed to the south and trouble with the Erlanger loan. In April and May 1863 the Confederates sold £220,000 of cotton bonds at approximately 91%, bringing in £199,340. In late May, £150,000 in Erlanger bonds were used by the Confederacy to settle part of a debt incurred by Caleb Huse and Saul Isaac, Campbell and Company. This firm received the bonds at the issue price of 90% and canceled a debt of £135,000. However, in July 1863, with General Grant's victory and the surrender of Vicksburg, the Confederacy was cut off from the Mississippi River and access to its cotton plantations, causing the value of cotton securities to fall drastically. This subsequently ruined the firm, damaging its holdings, credit, making future business prospects unlikely, and ultimately forcing the firm into declaring bankruptcy in 1869. The Confederate States of America, the firm's most valuable customer, ended up crippling the Isaac firm financially. By war's end, 60% of the cotton produced in the south during the war had gone to Britain.