The verified answer to “Important Battles question: Who won the Battle of Assaye (1803) during the Second Anglo-Maratha War?” is British forces under Arthur Wellesley, option B. The source-backed, question-specific record explains: The Battle of Assaye was fought on September 23, 1803, between the British East India Company under Arthur Wellesley (future Duke of Wellington) and the Maratha forces of Daulat Rao Scindia and Bhonsle. The British won decisively. This evidence establishes the historical relationship required in this Important Battles item. A correct solution must preserve the exact battle, date, participants, commander, location, outcome or significance requested by the stem. Similar periods, genres or national traditions do not make two battle facts interchangeable. Option B gives British forces under Arthur Wellesley and satisfies every condition stated in the question. The remaining choices—Maratha forces, French forces and Peshwa Bajirao II—do not satisfy the complete requirement. The reliable checking method is to identify the named battle first, recall or verify its verified participant or outcome, and then read qualifiers such as “both works,” “original language,” “first published,” “correctly matched” or “incorrectly matched.” These qualifiers determine what counts as the answer. Replaying that method for this Important Battles question confirms British forces under Arthur Wellesley without relying on option position.