Besieged city's bought/built units appearing outside the siege

[ExpiredReign]

I was giving Pericles a run and early on found Hojo on the same landmass, not what I wanted so he must be removed. Since it is early I declared war, no penalties if you do it early.

His capital is completely surrounded by my hoplites and I had a couple of archers pegging away at his defenses when he either buys or builds a heavy chariot and it appears outside my siege and runs through my archers destroying them instantly.

What! Did I see that? A couple of more turns just to make sure, and every 3 or 4 turns a new HC appears and takes out my archers.
That's when I rage quit. Come on, artificial strength boosts to units or faster healing maybe when playing on high difficulties (Emperor) but magically appearing units, that's too much.

 

[Browd]

Can you post a save file for the turn right before Pericles spawns the heavy chariot?

 

[ExpiredReign]

You mean: "Hojo spawns a HC"

This is an autosave early on in the siege, not sure if it is too many turns before he does it first. I built another archer in the city immediately south of the siege and just healed my existing hoplites to full strength whilst harassing wandering warriors from his northern city.
I'm going to play the game again from this point on and see if A) it is repeatable and B) it can be overcome with strategy.

Correction:
This is from later in the siege but Hojo still manages to spawn these units.