Wood of the Yggdrasl

Today is my favourite patriotic date in Argentina, when the battle of Caseros was fought, a battle of 5 hours with very few losses; this historic battle was decisive for argentinian history, and the national constitution was granted thanks to the victory of the rebellion. The first constitutional president was a general from my province, and several future presidents of the country participated in this battle.
Related to this, when I was a kid, the literature of Jorge Luis Borges introduced me to the pleasure of the norse mythology, all tinted with a code of Courage, Truth, Honour and Discipline.

More serpents lie under the ash of Yggdrasill
than any fool can imagine:
Goin and Moin, they are Grafvitnir's sons,
Grabak and Grafvollud,
Ofnir and Svafnir I think forever will
bite on the tree's branches.

From the Grímnismál (Sayings of Grímnir), Konungsbók (Codex Regius).