The phrase "army within" is correct and usable in written English.
It can be used in contexts discussing internal struggles, personal conflicts, or metaphorical battles one faces within themselves.
Example: "She felt an army within, battling her fears and insecurities every day."
Alternatives: "inner conflict" or "internal struggle".
Those requests say more about the influence of the army within Taiwan's armed forces than the island's military needs.
As a result, he said, he is now planning to separate from the Army within the year.
Instead of protecting its borders, Iraq will hide its army within its cities, where air strikes are effective only at an unacceptable (for America) cost in civilian deaths.
So the CNDP today forms an army within an army, maintaining many of their old positions as well as expanding their control to mineral-rich areas.
The women who bring charges of sexual assault against a man that lead to a trial generally resign from the Army within a year, she said, whether the man was found guilty or innocent.
The marines in Afghanistan -- roughly 2,000 now -- are slowly shifting their main base of operations from Camp Rhino to the Kandahar airport, with the expectation of turning the mission over to the Army within days or weeks.
On Sunday, Mr. Thein Sein said that although the army was "within arm's length" of Laiza, "we have announced that we will not overrun them".
It was of two great and terrible armies within himself, opposed and facing each other, silent.
The Soviet Union had promised the Nationalist government that it would withdraw its occupying armies within 90 days of Japan's surrender and return the region to China.
These new positions placed the opposing armies within 150 yards of one another.
This operation called for a concerted effort to crush the Soviet armies within the Izium salient, created south of Kharkov during the Soviet early spring offensives in March and April.
