What did frederick douglass mean when he told abraham lincoln that he was fighting with one hand behind his back ? giving need it asap

Frederick Douglass was an escaped slave who became a prominent activist, author and public speaker. He became a leader in the abolitionist movement, which sought to end the practice of slavery, before and during the Civil War. After that conflict and the Emancipation Proclamation of 1862, he continued to push for equality and human rights until his death in 1895.