When the civil war broke out in Brunei between Sultans Abdul Hakkul Mubin and Muhyiddin, the Sulu asserted their claim to Brunei's territories in northern Borneo.
Ketika perang saudara pecah di Brunei antara Sultan Abdul Hakkul Mubin dan Muhyiddin, Sulu menuntut klaim mereka atas wilayah Brunei di utara Borneo.