War of Resistance: Should I Mass-Produce Troops in Songhu, or Go Fully German-Equipped?

[Rapid Troop Recruitment] + [Exchanges] + [German Equipment] + [Going It Alone] + [From the Start in Songhu] Soldier king Xu Chang'an accidentally transmigrates to the Songhu battlefield and obtains a Troop Recruitment System. He rapidly builds up his forces on the battlefield to repel the Japanese invasion. He captures the enemy's weapons, exchanges them for a full set of German equipment, forms a special operations unit, beheads a Japanese prince, and strikes such terror into the Japanese that they dare not sleep at night.