Resistance: My Silver Dollar Can Summon

[Banhuangwen+anti-Japanese+not brainless] When Chen Yuan woke up, he traveled to the Songhu battlefield in 1937 where the war was raging! Before he could figure out the situation, he was forced to flee for his life by the defeated soldiers. At the critical moment of life and death, a cold mechanical voice sounded in my mind: [The war resource exchange system is activated! It is detected that the host holds silver coins, which can be exchanged for physical support. Chen Yuan exchanged the few pieces of ocean he had for a 70% new Hanyang-made gun and a few rounds of bullets, and barely managed to save his life. He soon discovered that this system was simply a "krypton gold" arsenal! Items as small as bullets and bandages, as large as artillery, tanks, and even elite soldiers (requiring special currency or a large amount of silver dollars) can be exchanged! But the price is high: a brand new official rifle costs 60 yuan, and a mortar plus artillery shells is an astronomical figure! Moreover, the quality of the exchanged items directly affects performance and reliability. There is a huge difference between 90% new and 50% new! Chen Yuan realized that in this troubled world where human life is at stake, silver dollars are power! He used his foresight and system to fight the Japanese and seize silver coins and supplies starting from a defeated soldier. However, the system is not omnipotent. Each call means huge resource consumption and logistical pressure, and is accompanied by the sacrifice of comrades. It also includes the increasing consumption of funds... The system cannot make him completely invincible.