We went out on two campaigns with the Messenger of Allah ﷺ during the month of Ramadan, the day of Badr and the conquest (of Makkah), and we broke the fast in both cases.
أَنَّهُ قَالَ غَزَوْنَا مَعَ رَسُولِ اللهِ ﷺ غَزْوَتَيْنِ فِي شَهْرِ رَمَضَانَ يَوْمَ بَدْرٍ وَيَوْمَ الْفَتْحِ فَأَفْطَرْنَا فِيهِمَا
he asked Ibn Al-Musaiyab about fasting on a journey, so he narrated to him that Umar bin Al-Khattab said: "We fought in two battles along with the Messenger of Allah during Ramadan; the Day of Badr, and the Conquest (of Makkah), so we broke our fast during them."
غَزَوْنَا مَعَ رَسُولِ اللَّهِ ﷺ فِي رَمَضَانَ غَزْوَتَيْنِ يَوْمَ بَدْرٍ وَالْفَتْحِ فَأَفْطَرْنَا فِيهِمَا قَالَ وَفِي الْبَابِ عَنْ أَبِي سَعِيدٍ
We went on a campaign with the Messenger of Allah ﷺ during Ramadan and the conquest took place in Ramadan, and we broke the fast in both cases.
غَزَوْنَا مَعَ رَسُولِ اللهِ ﷺ فِي رَمَضَانَ وَالْفَتْحَ فِي رَمَضَانَ فَأَفْطَرْنَا فِيهِمَا
"غَزَوْنَا مَعَ رَسُولِ الله ﷺ غَزْوَتَيْنِ فيِ رَمَضَانَ يَوْمَ الْبَدْرِ، وَيَوْمَ الْفَتْحِ، فَأَفْطَرْنَا فِيهِمَا".