Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ رَجَاءٍ، حَدَّثَنَا إِسْرَائِيلُ، عَنْ أَبِي إِسْحَاقَ، حَدَّثَنَا الْبَرَاءُ ـ رضى الله عنه ـ قَالَ غَزَوْتُ مَعَ النَّبِيِّ صلى الله عليه وسلم خَمْسَ عَشْرَةَ.Narrated Al-Bara:I fought fifteen Ghazawat in the company of the Prophet
From Sahih al-Bukhari, whose reports the scholars accept as authentic.