Sam was believed to be loyal to the Band of the Hawk as he always put his life on the line when in battle.
Golden Age Arc
After Guts lost his fight to Griffith and thus became a member of the Band of the Hawk, Corkus and some of his soldiers plotted to kill Guts in his sleep as revenge for killing Dante. Corkus ordered Sam to sneak inside Guts' tent and kill him. However, they were spotted by Casca, who sternly warned them off, and thus ended their attempt to kill Guts.