Throughout centuries a lot of wars have been waged, and it involved most of the time soldiers and citizens from all over the world.
Therefore it brought about a well-preserved “legacy” in museums. The Invalides museum is no exception to the rule for it is entirely dedicated to the reminiscences of the past wars (the civil war, the first and second world war and so many others). A real trip to the past and history is offered to you with exhibitons of quality, for instance you will find armours from the 13th century and from all the continents.
Indeed each country has its own way to dress during war time, this is why you will have several partitions. One is reserved for the Asian culture, you will see original armours and weapons from the continent .
Also, period like the middle age has some crossbows and spears to unveil belonging to knights who were doing tournaments. You also have some instruments used at the time;)