White Flag – The white flag is an internationally recognized protective sign of truce or ceasefire, and request for negotiation. . . The most common way of making a white flag is to obtain a pole and tie two corners of a sheet of cloth to the top of the pole and somewhere in the middle. (from Wikipedia)
When watching a movie that had fox hunting, I noticed how easy it was to see the beagles as they ran because of their white tipped tails. It very much reminded me of white flags waving in the air and easy for the hunters to see.