To some degree, I think thats what Amon Amarth were trying to achieve, inspiration through the music and lyrics.
Its basically the whole concept of honour that really makes you feel inspired. Songs like
Runes To My Memory where the emotion is there because of Johan's (I'll refer to him as a Viking warrior) will to fight, the depseration which you feel.
Hermods Ride To Hel, Honour to your family, family comes first. Hermod's intense battle to rescue his brother from the evil grasps of Hel, the way Hermod pleads for Baldr's release.
With Oden On Our Side, the serious progressing music, while Johan speaks of being outnumbered, but fighting on against all odds, honour, "Never give up".
Cry Of The Black Birds, Fighting your enemy, no fear, giving all that you have in battle, loyalty towards others, united as one you will conquer - There's all the inspiration you need.
Under The Northern Star, You have the slow emotional music going, Johan speaking about loyalty towards friends, friendship in general, the power of friendship...yeah basically every aspect of friendship, Like as he speaks of giving up his own life to safe another.
I'm not saying its inspiring you to fight in an ancient war, modernise the meanings for yourself. Personally this album makes me feel good somewhat. Thats just my opinion DON'T JUDGE MEEEEE, speak your thoughts though