The phrase "soldier down" is correct and usable in written English.
It can be used in contexts related to military situations, emergencies, or discussions about casualties.
Example: "During the training exercise, we had a soldier down, and immediate medical assistance was required."
Alternatives: "casualty" or "trooper down".
He calmed the soldier down and guided him back to his bunk.
The pair ran the soldier down in a car before hacking him to death with a meat cleaver and knives in a frenzied attack.
The British Muslim converts ran the soldier down in a car before hacking him to death with a meat cleaver and knives.
The British-born Muslim converts ran the soldier down in a car, breaking his vertebra and knocking him unconscious, before trying to decapitate him with a meat cleaver and knives.
The army claims that at one point Salaymeh was pointing a gun at the soldier, in another he knocked the soldier down and pointed a gun at him, and in a third version that he placed the gun at the soldier's temple.
The Muslim converts ran the soldier down in a car before hacking him to death with a meat cleaver and knives.
Politicians always let soldiers down, he says.
Commander orders soldiers down from vehicles http://t.co/QM3yZteXVd — Kareem Fahim (@kfahim) 3 Jul 13 Islamists climb on top of armoured vehicles.
Nowadays they look and dress like other soldiers, down to the weaponry, and address each other as "soldier-medic," with the emphasis on "soldier".
The blast wave had blown the soldiers down, and, though the platoon did not yet know it, killed a soldier on the trail.
He thinks that he let his soldiers down by letting them return to action after suffering concussions, and he wants to atone by helping to call attention to a system that fails so many soldiers and veterans.
