LH, On a broader sense most wars and military conflicts involve a disagreement of some form, if one considers that those involved have different perspectives and interests (such as personal gain). The cause of the conflict may be very different from what is believed by, or sold to, the troops and citizens on either side.

The crusades are an interesting example of these complexities. Those involved set aside many of their core religious values (that seemed to be importnat to them) to solve a disagrement over which religion should rule an area. That seems puzzling to me. However, one should never rule out that economic gain is not somewhere underneath such conflicts.