His wealth was mainly in very illiquid land. A lot of it was near worthless unless US won the war since it was beyond the line drawn by the Royal Proclamation of 1763 and white settlers were generally banned from settling there.
Otherwise like many landholders back in the day he was semi-broke and had limited access to cash.
Of course after the war of course he was both compensated for his expenses and got “his” land in Ohio (more or less)