Does the hadith apply to congregational prayer in a camp: "If he prays it in a desert and perfects its bowing and prostration, it will be worth fifty prayers"? And is it better to pray alone in the mosque or with the congregation in the camp?

Whoever is close to the mosque and hears the call to prayer is obligated to pray in congregation at the mosque, and it is not permissible for him to pray alone. This is based on the Prophet's (peace be upon him) saying: "Whoever hears the call [to prayer] and does not come, there is no prayer for him, except for an excuse." And his saying to the blind man: "Do you hear the call to prayer?" He said: "Yes." He said: "Then respond." As for the virtue of praying in the wilderness, it is for those who are far from the mosque and do not hear the call.