question #1 Sahih al-Bukhari 598, Book 9, Hadith 73 : What actions did Umar take when he missed the Asr prayer due to the circumstances of battle?

`Umar came cursing the disbelievers (of Quraish) on the day of Al-Khandaq (the battle of Trench) and
said, “I could not offer the `Asr prayer till the sun had set. Then we went to Buthan and he offered the
(`Asr) prayer after sunset and then he offered the Maghrib prayer.