Brady assembled a crew of 15 photographers to cover the Civil War. They took 3500 photographs.   Brady spent $100,000 of his own money for the undertaking.  He traveled across the battle fields in his "what-is-it wagon."  Confederate gunners probably appreciated Brady because it took so long for him to set up his equipment and make an exposure that it gave them plenty of time to site in their artillery. 

Some of his crew members resented the fact that he put his name on all images regardless of who actually took the photograph.

Brady eventually went blind but he continued to direct his staff which was divided between two galleries (New York and Washington).