The post that was quoted here has been removedThis is generally true, however 2 things must be considered:
1. Under the N-square law: It does not apply to whole armies, where tactical deployment means not all troops will be engaged all the time. It only works where each unit (soldier, ship, etc.) can kill only one equivalent unit at a time. This is often the case since the N-square law doesn't take into consideration difficult terrain, inclement weather, disease, and differences in battlefield tactics. The N-square law is a classic case of a formula that can be helpful in designing a military force, but is only occasionally relevant in the gritty toils of war.
2. If you're comparing very large armies such as China, Russia, or the USA a war that threatens their very survival will undoubtedly trigger the use of nuclear weapons. This will make formulas and calculations of armies shooting at each other rather useless.