One effect of the card is: "One German Fleet may reroll a single Naval Combat attack die."
Yet in the rules [184.108.40.206 Technology Effects], it states that if the card is active, "each German fleet is allowed to reroll its combat die once per combat resolution".
So, does the rulebook citation count as an official erratum for the card, or is the card text correct and the rulebook wrong?
Good catch. I'm soloing the game now and having a ball. My first WWI game and I'm really, really liking it. When I finish it I'm definitely going to play it through again. The way the Event Card mechanic works it'll be a different game every time.