Khaybar

Khaybar lies about 150 km north-west of Madinah and was inhabited by a tribe of Jews who incited hostilities towards the Muslims. The Prophet (s.a.w.), along with 1400 companions mounted an expedition and conquered their territory in Muharram 7 AH.

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References:
When the Moon Split - Shaikh Safiur-Rahman Mubarakpuri
Wikipedia