There are many synonyms that can be used for the phrase "for war." Some common ones include: in battle, engaged in combat, on the front lines, in the trenches, waging war, fighting for victory, in the midst of conflict, combat-ready, battle-tested, and battle-hardened. Each of these phrases brings its own unique connotation to the concept of warfare, whether it be a sense of grit and determination or a feeling of desperation and danger. Ultimately, each synonym serves as a reminder of the incredibly high stakes that are involved in any conflict, and the sacrifices that human beings often make in order to succeed.