I said not, seek ye me in vain

Numbers 10 outlines God's military instructions to the Israelites. What's interesting about that material is that God does not provide mechanical instructions on the fundamentals of fighting. Rather, God instructs the Israelites on how to call for his help (Numbers 10:9, KJV),

If ye go to war ... then ye shall blow an alarm with the trumpets; and ye shall be remembered before the Lord your God, and ye shall be saved from your enemies.

Note the certainty of the wording: "ye shall be remembered" and "ye shall be saved." Just by calling to God! This passage is surely also intended as instruction to us. When we "go to war," meaning when we encounter earthly or spiritual struggles, we should call to God, and he will hear us and save us.

That passage brings to mind a famous verse from Isaiah 45:19 (KJV),

I said not, ... seek ye me in vain.

God promises that calling to him is not a fruitless endeavor. He hears, he protects, and he saves.