Although the commanding of the troops should be easy, he was actually more afraid of the city's defensive perimeters than anything else. So far, he had the luxury of dealing with cities that had erected walls as well as places with chokepoints. He was blessed so far to have such fortunate ...incidents when it comes to city defences.
But this was not the same.
Precisely because this was a modern city, there were no walls to speak of as the 'wall' they had, had already been taken down by the Crystal Dragon Mechanoid which flew through the barrier and went to overload it, indirectly destroying the barrier generator, causing their wall to be destroyed. There was nothing else the city engineers can do other than to force their opinions to the higher up, requesting to build new generators since replacing the generators would be an easier job than repairing the current barriers.