The lesson is you can't pay the danegeld to make a problem go away - the only lasting solution is to get the power and sovereignty to do it yourself. Or as Kipling put it - "But Iron – Cold Iron – is master of them all."
"Political power grows out of the barrel of a gun"
--Mao Zedong.
If there were no other power than political, we wouldn't need weapons to fight wars or rebellions.