1803
Battle of Assaye
The setting
Near Assaye, on the Kaitna river in modern Maharashtra
Two rivers converging; Wellesley crossed at a ford he deduced must exist because villages stood on both banks opposite each other.
Reveal the outcome
Recorded sideBritish East India Company and allies under Arthur Wellesley
Recorded resultvictory, at very heavy cost
Company victory. Wellesley later called it the bloodiest action he ever fought - a judgement made after Waterloo.
How the atlas explains it
Wellesley found an unmarked ford by inference and crossed where the Maratha gunners had not sited their line, forcing them to redeploy under pressure. It nearly failed anyway: the Maratha artillery was better handled than the Company expected, and gunners who had feigned death rose and fired into the British rear after the line passed. The victory came from discipline under sustained artillery fire rather than from any elegance of manoeuvre.
What followed
Broke Maratha power in the Deccan and made Wellesley's reputation. Its value to the atlas is corrective: the Maratha artillery here was European-trained, well-sited and effective, which contradicts the standard framing of Indian armies as technologically outmatched.