Utterly not the case. Your personal experiences are not going to be the same as everyone else's, using them as evidence is not acceptable. "Common sense" for you is not going to be the same for others, especially from other countries (in my personal experience the number of people who have had homosexual experiences and relationships whilst identifying as heterosexual is significantly high. But that isn't evidence of anything other than diversity of experience).
No I wouldn't agree that everyone is purely bisexual as you seem to be implying here. I am claiming that the strict division of sexual orientation and practice that your argument imposes are not reflected in reality.
But we aren't looking for the percentage of a population that identifies as homosexual or not. The entire point of this thread has been whether or not behaviour is a true reflection of identity. If you want to get an answer to your question you're going to have to do more than fire up wikipedia and actually do some reading on the subject. Hence my suggestion that you look up articles on the kinsey scale or read the article I posted about men who have sex with men and read on from there.
I'm not discrediting it. I'm asking you for clarification which you are unable to provide. You're quoting one sentence, on wikipedia of all places, as an attempt to substantiate the claim that an ancient army was made up of people who we would identify as homosexual in the modern, western world.