Battle of Papremis, how?

Okay, things are like this:

Rebel lybian prince of saitian origins has managed to collect an army big enough to present battle to Lower Egypt Satrap Achemenes's army. The battle happened at Papremis ca. 461BCE, some 100 Km down the Nile from Memphis.

Inaros won, and killed Achemenes. The trick is: how?

I'm setting things up this way: Inaros's army is blocking Papremis harbor and sieging the city when the Egyptian-Persian army arrives. It seems logical that after negotiations are conducted (and failed) the Satrap must have tried to get Papremis harbor back into his control, because that way he could reinforce Papremis garrison (necessarily small) and take the rebels in a clamp movement.

Now, fluvial battles and night incursions to re-take the harbor must have failed, because we know they had a big, ground battle, where Inaros killed Achemenes (in personal combat? romantic but doubtful).

I have imagined Papremis with a walled town and walls that could even extend to the harbor, but this is not necessary for the story to work out well. Nevertheless it would have made sense, and my analysis comes from this suposition. Even if Papremis could be isolated from her harbor, taking control of it would cut the rebels' ability to receive support from other cities down the Nile, water, food, etc... what's bad for the enemy is good for you, uh?

So, does this make any sense?

And, better, any reliable (or demi-reliable) maps of Papremis I could work on? *grin*

And worry not, we'll be back to this discussion (and much better, even) when we talk about Memphis, and how a composite force of Egyptian rebels and Greek forces (200 triremes!) weren't able to take Memphis fort in 5 years! Sounds like fun? Sure it is! :-)

thanks, I'll eagerly wait for your suggestions