Did Shakespeare intend Troilus and Cressida to be a comedy?

According to Shakespearean scholar Jackson J. Campbell, although Troilus and Cressida is today classified as a comedy, the editors of the First Folio originally scheduled the play to be included in the section containing the tragedies. Due to a conflict with the printer, however, Troilus and Cressida was published after the rest of the tragedies, and thus was placed in between the histories and the tragedies, after Henry VIII and before Coriolanus.

What sources did Shakespeare use in writing Troilus and Cressida?

Shakespeare relied upon several sources as he composed Troilus and Cressida, including translations of Homer's Iliad by George Chapman and William Caxton, and Geoffrey Chaucer's epic poem Troilus and Cressida.