I have yet to apply the strategies to Dag combat, but history proves how amazingly helpful the concepts are. And, I have an example of how well this works.
It was the summer after my senior year, the Art of War had been a graduation gift from my best friend. At my last time at Church camp as a student, we played a game with four teams. The field was split into four sections and each team was given one and several tennis balls to guard. If we were tagged in another team's territory, we were captured until freed. The goal was to collect the other teams' tennis balls. We were the pink team, the smallest, and we allied with our neighbors, the blue because they had the most people, most of whom were large and athletic. However, we watched carefully for treachery. We focused on defense, letting the blue team deal with most of the fighting. A few of us adventured out and brought back plenty of tennis balls, but didn't target anyone specifically or make enemies with neighboring teams.
Eventually, our other neighbor fell, leaving only Pink, Blue, and Yellow. We had the most tennis balls and were beginning to draw attention, but the game was called because it was taking too long. Every tactic was based on something I'd read in Art of War, and they were obviously effective, we won by a huge margin.