But when he had time to reconsider his position , he realized his chances of winning a war against Constantine was doubtful . . But when he had time to reconsider his position , he inevitably saw that his chances of winning a war against Constantine was doubtful at best , especially given that he was well aware of Constantineâ s strengths as Constantine had been his guest for some time at Nicomedia , not to mention the attachment of the troops to him .