Big Serge outlines the Soviet invasion of Manchuria in August 1945 and its devastating impact on the Japanese Kwantung Army, finally shattering any remaining illusions that the Soviets would broker a peace between Japan and the western allies:

August Storm: The Soviet Invasion of Manchuria (August 9-20, 1945)

The Second World War had a strange sort of symmetry to it, in that it ended much the way it began: namely, with a well-drilled, technically advanced and operationally ambitious army slicing apart an overmatched foe. The beginning of the war, of course, was Germany’s rapid annihilation of Poland, which rewrote the book on mechanized operations. The end of the war — or at least, the last major land campaign of the war — was the Soviet Union’s equally totalizing and rapid conquest of Manchuria in August 1945.

Manchuria was one of the many forgotten fronts of the war, despite being among the oldest. The Japanese had been kicking around in Manchuria since 1931, consolidating a pseudo-colony and puppet state ostensibly called Manchukuo, which served as a launching pad for more than a decade of Japanese incursions and operations in China. For a brief period, the Asian land front had been a major pivot of world affairs, with the Japanese and the Red Army fighting a series of skirmishes along the Siberian-Manchurian border, and Japan’s enormously violent 1937 invasion of China serving as the harbinger of global war. But events had pulled attention and resources in other directions, and in particular the events of 1941, with the outbreak of the cataclysmic Nazi-Soviet War and the Great Pacific War. After a few years as a major geopolitical pivot, Manchuria was relegated to the background and became a lonely, forgotten front of the Japanese Empire.

Until 1945, that is. Among the many topics discussed at the Yalta Conference in the February of that year was the Soviet Union’s long-delayed entry into the war against Japan, opening an overland front against Japan’s mainland colonies. Although it seems relatively obvious that Japanese defeat was inevitable, given the relentless American advance through the Pacific and the onset of regular strategic bombing of the Japanese home islands, there were concrete reasons why Soviet entry into the war was necessary to hasten Japanese surrender.

More specifically, the Japanese continued to harbor hopes late into the war that the Soviet Union would choose to act as a mediator between Japan and the United States, negotiating a conditional end to war that fell short of total Japanese surrender. Soviet entry into the war against Japan would dash these hopes, and overrunning Japanese colonies in Asia would emphasize to Tokyo that they had nothing left to fight for. Against this backdrop, the Soviet Union spent the summer of 1945 preparing for one final operation, to smash the Japanese in Manchuria.

The Soviet maneuver scheme was tightly choreographed and well conceived — representing in many ways a sort of encore, perfected demonstration of the operational art that had been developed and practiced at such a high cost in Europe. Taking advantage of the fact that Manchuria already represented a sort of salient — bulging as it did into the Soviet Union’s borders — the plan of attack called for a series of rapid, motorized thrusts towards a series of rail and transportation hubs in the Japanese rear (from north to south, these were Qiqihar, Harbin, Changchun, and Mukden).

By rapidly bypassing the main Japanese field armies and converging on transit hubs in the rear, the Red Army would effectively isolate all the Japanese armies both from each other and from their lines of communication to the rear, effectively slicing Manchuria into a host of separated pockets.

There were, of course, a host of reasons why the Japanese had no hope of resisting this onslaught. In material terms, the overmatch was laughable. The Soviet force was lavishly equipped and bursting with manpower and equipment — three fronts totaling more than 1.5 million men, 5,000 armored vehicles, and tens of thousands of artillery pieces and rocket launchers.

The Japanese (including Manchurian proxy forces) had a paper strength of perhaps 900,000 men, but the vast majority of this force was unfit for combat. Virtually all of the Japanese army’s veteran units and equipment had been steadily transferred to the Pacific in a cannibalizing trickle — a vain attempt to slow the American onslaught. Accordingly, by 1945 the Japanese Kwantung Army had been reduced to a lightly armed and poorly trained conscript force that was suitable only for police actions and counterinsurgency against Chinese partisans.

Really, there was nothing for the Japanese to do. The Kwantung Army had far less of a fighting chance in 1945 than the Wehrmacht had in the spring of that year, and everyone knows how that turned out. Unsurprisingly, then, the Soviets broke through everywhere at will when they began the assault on August 9. Soviet armored forces found it trivially easy to overrun Japanese positions (armed primarily with archaic, low caliber antitank weaponry that could not penetrate Soviet armor even at point blank range), and by the end of the first day the Soviet pincers were driving far into the rear.

It is easy, in hindsight, to write off the Manchuria campaign as something of a farce: a highly experienced, richly equipped Red Army overrunning and abusing an overmatched and threadbare Japanese force. In many ways, this is an accurate assessment. However, what the offensive demonstrated was the Red Army’s extreme proficiency at organizing enormous operations and moving at high speeds. By August 20 (after only 11 days), the Red Army had reached the Korean border and captured all their objectives in the Japanese rear, in effect completely overrunning a theater that was even larger than France. Many of the Soviet spearheads had driven more than three hundred miles in a little over a week.

To be sure, the combat aspects of the operation were farcical, given the totalizing level of Soviet overmatch. Red Army losses were something like 10,000 men — a trivial number for an operation of this scale. What was genuinely impressive — and terrifying to alert observers — was the Red Army’s clear demonstration of its capacity to organize operations that were colossal in scale, both in the size of the forces and the distances covered.

More to the point, the Japanese had no prospect of stopping this colossal steel tidal wave, but who did? All the great armies of the world had been bankrupted and shattered by the great filter of the World Wars — the French, the Germans, the British, the Japanese, all gone, all dying. Only the US Army had any prospect of resisting this great red tidal wave, and that force was on the verge of a rapid demobilization following the surrender of Japan. The enormous scale and operational proclivities of the Red Army thus presented the world with an entirely new sort of geostrategic threat.