Translation for 3:13

قَدۡ كَانَ لَكُمۡ ءَايَةٞ فِي فِئَتَيۡنِ ٱلۡتَقَتَاۖ فِئَةٞ تُقَٰتِلُ فِي سَبِيلِ ٱللَّهِ وَأُخۡرَىٰ كَافِرَةٞ يَرَوۡنَهُم مِّثۡلَيۡهِمۡ رَأۡيَ ٱلۡعَيۡنِۚ وَٱللَّهُ يُؤَيِّدُ بِنَصۡرِهِۦ مَن يَشَآءُۚ إِنَّ فِي ذَٰلِكَ لَعِبۡرَةٗ لِّأُوْلِي ٱلۡأَبۡصَٰرِ ١٣
Indeed, there was a sign for you in the two armies that met in battle—one fighting for the cause of Allah and the other in denial. The believers saw their enemy twice their number.1 But Allah supports with His victory whoever He wills. Surely in this is a lesson for people of insight.

Foot notes

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 It can also be understood that the disbelievers were made to think there were twice as many believers in the battlefield.