In the spring of 1864, the Governor of Ohio, John Brough, was concerned with preventing Confederate invasions of the North, as Brigadier General John Hunt Morgan's cavalry raid of Ohio had done during 1863. As the Civil War entered its fourth year, troops were increasingly difficult to raise both North and South. In the North, substantial bounties were offered to induce enlistment and the unpopular draft and substitute system was used to meet quotas.