Start of the Alder tree month in the Celtic calendar. Alder is the tree of the god Bran and fourth month in the Celtic Tree Calendar.
Alder sap was used to make gunpowder and its wood was used to make shields. The ancient Celts used this association to remind them that the true wisdom of the warrior is to know when to arm yourself and fight and when to take up the shield and defend. Couple strength and courage with generosity and compassion.