"So long as the opposing forces are at the outset approximately equal in numbers and moral and there are no flanks to turn, a long struggle for supremacy is inevitable"

This quote by Douglas Haig recommends that when two opposing forces are of equivalent strength and size, and there is no chance to outflank the enemy, a long and extracted battle is inescapable. This is because both sides are equally matched and neither can get an advantage over the other. This quote is especially relevant to the First World War, where the opposing forces were typically of equivalent strength and there were no flanks to turn. Haig's quote highlights the value of having an advantage over the enemy in order to win a fight, and the futility of a long struggle for supremacy when both sides are evenly matched. It also works as a reminder of the destructive consequences of war, and the importance of finding a peaceful resolution to conflicts.