I don't know all the details about the real battle of 'Red Cliff'. Just that not as many men participated in it than the novels says. Cao Cao's forces were certainly vast outnumbered the Wu-Shu Alliance. Four to one or something like that. Anyway in the novel Zhuge Liang is portrayled as the ultimate stragiest, in Rome: TW he'd have 10 in all his traits.