He decided to follow the enemy aliens to see where they went.
Some enemy aliens were held without trial during the entire war.
From 1940 to 1941 he was imprisoned as an enemy alien.
You'd be enemy aliens, but there are conventions about this sort of thing.
He left for Germany in 1916 after being designated an enemy alien.
He had been thinking hard, trying to think like the enemy alien before him, to dig into them and know what their minds held.
Upon being discharged from the hospital, he was arrested as an enemy alien.
The following year he was interned as an enemy alien.
Even before the money ran out, they would probably be interned as enemy aliens.
The rights of a person arrested under ordinary circumstances are not available to an enemy alien.
Wörterbuch für Militärbegriffe