Final answer:
The right-handed twin learns to win the battle by understanding and implementing five key strategic principles. These principles emphasize the importance of knowing when to fight, handling different forces effectively, ensuring unity of spirit, being prepared, and having unfettered military capacity.
Step-by-step explanation:
The student's question seems to be related to a narrative or story that includes themes of strategy, conflict, and reflection. The right-handed twin, from the context of the question, seems to be a metaphorical character or could be part of a cultural or mythical story. To win the battle with his brother, the right-handed twin must develop strategic understanding and recognize the five essentials for victory. These include:
Knowing when to fight and when not to fight,
Handling both superior and inferior forces,
Having an army animated by the same spirit,
Being prepared and waiting to take the enemy unprepared,
Having military capacity without interference from the sovereign.
By internalizing these principles and putting them into practice, as suggested by the excerpts, the right-handed twin would be able to secure victory over his brother. Additionally, the story implies that understanding one's actions and their consequences, as shown by the anecdote of Cain and Abel, is essential to avoid downfall and loss.