"enemy group" is correct and usable in written English.
You can use it to describe a group of people or entities that the speaker or writer perceives as hostile or adversarial. For example, "The leader of the enemy group was well known for his lack of compassion."
The adult male Bud nursed wounds he had received from an enemy group that he had encountered.
They argued that its existence chilled their constitutional rights by creating a basis to fear that the government might seek to detain them under it by declaring that their activities made them supporters of an enemy group.
On the second day of a four-day exercise simulating an anti-terrorist operation, in which troops had to search for and neutralise an enemy group, Tvarusko complained of a sore knee in 38C midday heat.
That part of the ruling rejected the detainee lawyers' claim that the laws of war do not allow the president to detain "civilians" merely for being members of an enemy group.
The standard could signal an end to "signature strikes," or attacks on groups of unknown men based only on their presumed status as members of Al Qaeda or some other enemy group — an approach that administration critics say has resulted in many civilian casualties.
Don't think you're part of an enemy group, because you're not a visible minority?
Most natural enemy groups responded positively to organic farming although this was not true for Coleopterans.
However, patterns of emergence and activity density differed between individual natural enemy groups.
Moreover, evenness effects among natural enemy groups were independent and complementary.
Later, she told journalists he was suspected of spying for enemy groups.
Some children were held captive in small holes in the ground as punishment or after being captured by enemy groups, the statement said.
