I thought declaring a joint war on someone was the same as declaring a surprise war. I didn't receive my bonus movement from declaring a joint war on Cleopatra just now. I offered Peter a joint war and he accepted. What gives? The only thing I can think of is that Cleo had denounced me and I was able to declare a formal war. I could have sworn joint always went surprise, but is it possible it will go formal if you have the option for a formal war?