Secondly...
Secondly, the Messenger did not permit any Sahabi to leave his presence, as reported by the Qur’an about the Battle of Khandaq: وإذ قالت طائفة منهم يا أهل يثرب لا مقام لكم فارجعوا ويستأذن فريق منهم النبي يقولون إن بيوتنا عورة وما هي بعورة إن يريدون إلا فرارا ولو دخلت عليهم من أقطارها ثم سئلوا الفتنة لآتوها وما تلبثوا بها إلا يسيرا ولقد كانوا عاهدوا الله من قبل لا يولون الأدبار وكان عهد الله مسئولا قل لن ينفعكم الفرار إن فررتم من الموت أو القتل وإذا لا تمتعون إلا قليلا And when a party of them said, “O people of Yathrib!
You do not stand any chance. Therefore, return”. And a band of them asked for permission of the Prophet, saying: “Truly, our homes are vulnerable!” But they (i.e. their houses) were not vulnerable. They (i.e. those soldiers) only wished to flee ! And if the enemy had entered upon them from its (i.e. Madinah’s) borders, and they had been asked to commit sedition (against Islam), they would surely have committed it and would have only hesitated a little.
And indeed they had already made a covenant with Allah not to flee, and a covenant with Allah must be answered for. Say: Running away will not benefit you if you flee from death or killing, and then you will enjoy no more than a little while!”[^6] The verses confirm that the enemy never breached the borders of Madinah. They further establish that the homes of the people of the city were safe. Of course, it was the Battle of Khandaq (i.e. the Battle of the Trench).
Therefore, all the fighting was supposed to be done at the trench , not within the boundaries of Madinah. Lastly, there is zero evidence of any deployment of anyone by the Prophet, during the battle, to mount any ambush in any garden in the city! As such, the presence of ‘Umar and his colleagues in a safe garden had absolutely no military value or legitimacy. Moreover, one of them was masking his face to conceal his identity. Meanwhile, he too had no tactical or strategic reason to use a mask.
It is obvious, from the circumstances and his conduct, that he felt shame for what they were doing in the garden, and would not like anyone to identify him with it, if they were detected. But, Umm al-Muminin ‘Aishah knew his voice very well, being his relative. So, it was pointless for him to conceal his identity before her while criticizing ‘Umar. ‘Umar and his colleagues were, without doubt, hiding from battle. They had fled!