The face of the girl resembles with that of her mother.

The word "lest" means "for fear that," and it is followed by a bare infinitive (without "may" or "should"). So, "lest you may forget" is grammatically incorrect. The correct form is "lest you forget."

 mightiest এর আগে  the বসবে কারন mightiest  superlative form.

Articles: We usually omit "the" before "war" when speaking generally or about war in a broad sense.

Punctuation: A full stop should be placed inside the quotation marks.

If the sentence is referring to a specific war, then:
The General said, "Do or die in the war."