The strategy employed in "Water Margin" is a blend of guerrilla warfare and strategic alliances. This is evident in the way the outlaws, led by Song Jiang, use hit-and-run tactics against the oppressive government forces, while also forming alliances with various factions to strengthen their position and resources.

In the novel, the outlaws are constantly on the move, avoiding direct confrontations with the government army. This guerrilla warfare strategy is effective because it allows them to conserve their strength and resources while wearing down their enemies. The outlaws' ability to adapt and change their tactics quickly is a key factor in their success. For example, when they are surrounded by government troops, they often retreat to a nearby mountain or forest, where they can regroup and launch surprise attacks.

Additionally, the outlaws form strategic alliances with various factions, including local officials, merchants, and even some members of the government. These alliances provide them with valuable resources, such as food, shelter, and weapons. One notable example is their alliance with the Liangshan Marsh, a group of rebels who have taken control of a region and are willing to support the outlaws in exchange for protection and assistance.

The data supporting this analysis comes from the novel itself. "Water Margin" is a historical novel set during the Song Dynasty, and it is filled with examples of the outlaws' strategic thinking. The author, Shi Nai'an, clearly demonstrates the effectiveness of guerrilla warfare and strategic alliances in achieving their goals. For instance, in the novel, the outlaws are able to defeat a much larger army by using hit-and-run tactics and forming alliances with local factions.

Furthermore, the outlaws' success can be attributed to their ability to adapt to changing circumstances. They are not afraid to change their tactics if they are not working, and they are always looking for ways to improve their situation. This flexibility is a crucial aspect of their strategy.

In conclusion, the strategy used in "Water Margin" is a combination of guerrilla warfare and strategic alliances. This approach allows the outlaws to conserve their resources, wear down their enemies, and gain valuable support from various factions. The novel's portrayal of these strategies is a testament to the effectiveness of adaptability and strategic thinking in achieving success.