On the other hand, the "crossed fingers" was a sign of hope and good luck exchanged between
Englishmen before a battle, meaning that these fingers and, therefore, they themselves would
survive.

So we uncovered the historical origin of "crossed fingers" in this little excursion...intriguing! Thanks, Keiva.
And also revalidated the two-fingered version of flipping-the-bird, which you once asked about.