Which of the following is not true about First Anglo-Mysore War?

The statement that Hyder Ali defeated the English in the First Anglo-Mysore War is not true. In fact, it was the opposite. The First Anglo-Mysore War, which took place from 1767 to 1769, was primarily between the British East India Company and the Kingdom of Mysore under the leadership of Hyder Ali.

During this war, the British forces were led by Colonel Joseph Smith and later by Colonel Sir Robert Clive, while Hyder Ali commanded the Mysorean forces. The war ended without a clear victory for either side, and the Treaty of Madras (Option C) was signed in 1769, restoring the status quo ante bellum.

Option A: The First Anglo-Mysore War did indeed take place from AD 1767 to 1769.
Option B: As mentioned, Hyder Ali did not defeat the English in this war.
Option C: The Treaty of Madras was the result of the First Anglo-Mysore War, and this statement is true.
Option D: This option is incorrect since Option C is true; not all statements are incorrect.

Therefore, the correct option is Option B: Hyder Ali defeated the English in the First Anglo-Mysore War, as it is not true.