"The knee-jerk response from most Brits and historians is to scoff and say that’s because they weren’t there. It makes no military sense to ship soldiers from India to France. There’s no popular memory of colonial troops there. Even the Ministry of Defence in London initially rejected suggestions that Indian troops were there.
But they were. Four companies of the Royal Indian Army Service Corps (RIASC), plus headquarters and support detachments. Perhaps 1,000 men.
And their service has literally been whitewashed out of history.
When the British army went to France at the beginning of the war, it was a totally mechanized force, which was revolutionary for its time. But as soon as they got into the field, they realized they were having a problem moving supplies and equipment over rough ground. So, the call went out to the empire for animal transport companies.
The empire at the time included India and what's now Pakistan, and a force was assembled — labeled K6 — to provide the vital role of mule and horse transport.
These men were not frontline soldiers, but they were all long-service professionals in what was an all-volunteer force. They were trained to fight, and in the chaos of the Battle of France in May and June of 1940, they did fight, took casualties and some of the men were decorated for bravery."