The reality of spiritual warfare

ثُمَّ لَـَٔاتِيَنَّهُم مِّنۢ بَيْنِ أَيْدِيهِمْ وَمِنْ خَلْفِهِمْ وَعَنْ أَيْمَـٰنِهِمْ وَعَن شَمَآئِلِهِمْ ۖ وَلَا تَجِدُ أَكْثَرَهُمْ شَـٰكِرِينَ

Then I will come to them from before them and from behind them and on their right and on their left, and You will not find most of them grateful [to You]."

وَٱسْتَفْزِزْ مَنِ ٱسْتَطَعْتَ مِنْهُم بِصَوْتِكَ وَأَجْلِبْ عَلَيْهِم بِخَيْلِكَ وَرَجِلِكَ وَشَارِكْهُمْ فِى ٱلْأَمْوَٰلِ وَٱلْأَوْلَـٰدِ وَعِدْهُمْ ۚ وَمَا يَعِدُهُمُ ٱلشَّيْطَـٰنُ إِلَّا غُرُورًا

And incite [to senselessness] whoever you can among them with your voice and assault them with your horses and foot soldiers and become a partner in their wealth and their children and promise them." But Satan does not promise them except delusion.

أَلَمْ تَرَ أَنَّآ أَرْسَلْنَا ٱلشَّيَـٰطِينَ عَلَى ٱلْكَـٰفِرِينَ تَؤُزُّهُمْ أَزًّا

Do you not see that We have sent the devils upon the disbelievers, inciting them [to evil] with [constant] incitement?