Nearby ayahs help place verse 48:2 in sequence and meaning.
إِنَّا فَتَحْنَا لَكَ فَتْحًا مُّبِينًا
Indeed, We have given you, [O Muhammad], a clear conquest
وَيَنصُرَكَ ٱللَّهُ نَصْرًا عَزِيزًا
And [that] Allah may aid you with a mighty victory.
هُوَ ٱلَّذِىٓ أَنزَلَ ٱلسَّكِينَةَ فِى قُلُوبِ ٱلْمُؤْمِنِينَ لِيَزْدَادُوٓا۟ إِيمَـٰنًا مَّعَ إِيمَـٰنِهِمْ ۗ وَلِلَّهِ جُنُودُ ٱلسَّمَـٰوَٰتِ وَٱلْأَرْضِ ۚ وَكَانَ ٱللَّهُ عَلِيمًا حَكِيمًا
It is He who sent down tranquillity into the hearts of the believers that they would increase in faith along with their [present] faith. And to Allah belong the soldiers of the heavens and the earth, and ever is Allah Knowing and Wise.