Going to battle outnumbered was never a pleasant feeling.
The simple reason for this was with a larger army, one could form a longer battle line, which would allow them to outflank and envelop the opposing small army from both sides.
This meant that in a traditional battle, the smaller force would be forced to match this extended line, resulting in thinner lines, and more prone to breaking.
Hence, all things equal, usually the one with the larger army won.
Which was also why winning with a smaller army was so celebrated and applauded, both in this timeline and in Alexander's previous life.
"Can we expect any reinforcements from our allies? Amenheraft is blatantly breaking the treaty," Heliptos made this request some the third time.
"There will be no reinforcements. We are on our own," And Alexander again very clearly let this be known as he had stated the reasons before, to the disheartenment of many.