Wingate's headquarters returned to India on its own ahead of most of the columns. Through the spring and even into the autumn of 1943, individual groups of men from the Chindits made their way back to India. The army did what they could for the men. In one case, an aeroplane was landed in an open area and wounded men were evacuated by air. Part of one column made it to China. Another body of men escaped into the far north of Burma. Others were captured or died. By the end of April, after a three-month mission, the majority of the surviving Chindits had crossed the Chindwin river, having marched between 750–1,000 miles. Of the 3,000 men that had begun the operation, a third (818 men) had been killed, taken prisoner or died of disease, and of the 2,182 men who returned, about 600 were too debilitated from their wounds or disease to return to active service. Of the remaining men, Wingate practically hand picked those few he would retain, while the rest were put back under the normal army command structure as part of their original battalions. Although British Army officers in India criticised the effectiveness of the Chindits (Japanese railway communications had been out of commission for less than a week), their effect on the morale of the Allied troops in India was refreshing, and they were given plenty of publicity. Wingate wrote an operations report on returning to India, which was controversial for many reasons, including attacks on officers under his command. The report had a tendency to excuse any mistakes made by its author (Wingate), while making vicious attacks on other officers, often based on limited information. Eventually, through his political allies in London, a copy of the report was given to Winston Churchill, who was impressed and took Wingate with him to the Quebec Conference. His concepts for long-range penetration operations behind Japanese lines received official backing at high level, and he obtained substantial US support for his force. The US Army also began its own plans for the group that later became Merrill's Marauders. As the members of the first expedition were making their way back to India, a second long range penetration unit, 111th Indian Infantry Brigade was being formed. Popularly known as "The Leopards", the brigade was raised by General Wavell without the knowledge of Wingate, who was still in Burma and who was known to have a strong dislike for the Indian Army, its diverse troop formations, and its British officers in particular.