Hypothetically, since life is a war itself, those tactics and strategies could be used. To illustrate that, this article will go through some tactics and strategies as devised by the renowned Chinese strategist Sun Tzu, as written in his book “Art of War.”
“An army may be likened to water, for just as flowing water avoids the heights and hastens to the lowlands, so an army avoids strength and strikes weakness.”
In the field of business, it could be suicidal to entirely face a rival firm head on, especially if it is financially better and has larger economies of scale. You could do better by looking at other ways to find more customers. You could strike where your rival is weak.