Units suddenly appear even though I have max AC

Is this an AI? Or maybe the unit was built when you got there?

There were no barracks in the city

Ai can spawn units out of thin air.

elite ai can

How do you know if it is a elite ai

Should say on the game description

it says nothing

Komrade Khrushchev wrote:

it says nothing

There have been many problems with the stealth/anti-stealth mechanisms over the past few months. This case is likely one example.

Since the down grades to CoW -1.5 started, all programmed controlled countries are considered "Elite AI". The behavior has not improved, however. The poor programming often results in undefended cities while sending units far afield to capture unguarded provinces of the enemy. Another example:

Building several flying bombs in a city with no airfield, and letting them rot there until overcome by a real enemy.

cycle9 wrote:

There have been many problems with the stealth/anti-stealth mechanisms over the past few months. This case is likely one example.

Since the down grades to CoW -1.5 started, all programmed controlled countries are considered "AI". The behavior has not improved, however. The poor programming often results in undefended cities while sending units far afield to capture unguarded provinces of the enemy. Another example:

Building several flying bombs in a city with no airfield, and letting them rot there until overcome by a real enemy.