Sifrei Bamidbar 76

(Bamidbar 10:9) "And if you go to war in your land": whether you go out against them or they come against you. Does this speak of the foe that assails you in the war of Gog and Magog or of wars in general? It is written (Ibid.) "and you will be saved from your enemies." Go out and see: In which war is Israel saved without subjugation to follow? In the war of Gog and Magog, as it is written (Zechariah 14:3, 9) "And the L-rd will go out and wage war against those nations … And the L-rd will be King over all the land." R. Akiva says: This ("then you shall sound the trumpets") tells me only of war. Whence do I derive (the same for) blast, mildew, difficult labors, and tempest-tossed vessels? From (Bamidbar, Ibid.) "against the oppressor that oppresses you" — against any "oppression" that may befall the people. "then you shall sound the trumpets and you will be remembered before the L-rd your G-d." R. Akiva says: Now do the trumpets cause remembrance (before the L-rd)? The intent is that if they were in a position to blow (the trumpets) but failed to do so, it is reckoned to them as if they were not remembered before the L-rd. "and you will be remembered … and you will be saved." Whenever Israel is "remembered," it is remembered only for salvation.