No, there I will disagree: During battle, least wounded gets treated first so they can get back to the lines. Most severe (and those needing very long lengths of care) are put aside until the others are stabilized and safe.
That form of triage occurs (historically, for the US) at battalion aid level or below. Those who can be reasonably patched up and sent back out get that - anything more involved gets stabilized as much as possible and sent up to higher medical aid, which is where the more classic form occurs.
Triage also occurs in other contexts not involving medical care or life-threatening scenarios - it occurs or is supposed to occur when you have a host of issues and don’t have enough resources to immediately fix all of them. You have to establish priority somehow.
Now, during “regular” care the most severely wounded do get treated first, because they “are” life threatened.
Leeme get this straight, in battle, a shrapnel wound to a foot would be treated before a sucking chest wound?
Really?