What did being "on the attack" signify for the Allies during the war?

Being "on the attack" for the Allies during the war signified a proactive approach in their efforts. This phrase encapsulated the shift in strategy where Allied forces would take the initiative to launch offensives against enemy positions, rather than merely responding to enemy actions. This involved planning and executing military operations aimed at advancing their positions, reclaiming territory, and ultimately seeking to dismantle the opposing forces.

This proactive approach was essential for the momentum of the war, as it allowed the Allies to seize the initiative, maintain pressure on enemy forces, and create openings for victory. The other options do not accurately reflect the idea of "being on the attack." Moving into defensive strategies implies a reactionary posture rather than taking the initiative, recruiting more soldiers focuses on manpower rather than offensive actions, and negotiating peace treaties would not occur in the context of actively engaging in combat operations. Therefore, the choice that best describes "being on the attack" in this context is taking a proactive approach in their efforts.