"I was next to Zaid bin Arqam when he was asked: 'How many battles did the Prophet (ﷺ) fight ?' He said: 'Nineteen.' So I said: 'How many battles did you take part in with him ?' he said: 'Seventeen.' I said: 'Which of them was the first?' He said: 'Dhat Al-Ushaira' or Al-'Usaira'. '" [Abu 'Eisa said:] This Hadith is Hasan Sahih.
حَدَّثَنَا مَحْمُودُ بْنُ غَيْلاَنَ، حَدَّثَنَا وَهْبُ بْنُ جَرِيرٍ، وَأَبُو دَاوُدَ الطَّيَالِسِيُّ قَالاَ حَدَّثَنَا شُعْبَةُ، عَنْ أَبِي إِسْحَاقَ، قَالَ كُنْتُ إِلَى جَنْبِ زَيْدِ بْنِ أَرْقَمَ فَقِيلَ لَهُ كَمْ غَزَا النَّبِيُّ صلى الله عليه وسلم مِنْ غَزْوَةٍ قَالَ تِسْعَ عَشْرَةَ . فَقُلْتُ كَمْ غَزَوْتَ أَنْتَ مَعَهُ قَالَ سَبْعَ عَشْرَةَ . قُلْتُ أَيَّتُهُنَّ كَانَ أَوَّلَ قَالَ ذَاتُ الْعُشَيْرَاءِ أَوِ الْعُسَيْرَاءِ . قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ .
Tirmizi
The Book on Jihad • Hadith 1724