I see the word "strong" refers to a group of army in two contexts:
In this post:
We're now a sub of nearly six hundred thousand strong
In this context the word "strong" refers to the subscribers of the subreddit.
In this game:
Here we go loading up for a huge strong
Here the word refers to a group of army about to be dropped to the opponent's base.
But Oxford Dictionaries doesn't count this as a meaning of the word. Is this the case the dictionary hasn't caught up the usage of the word? Can it be used as a noun?