横向
1
Armed conflict between nations
3
Exchange of goods between peoples
7
Succession of rulers from same family
8
Armed entry into another territory
9
Metal that replaced bronze in tools
10
Movement of people to new areas
13
Sudden overthrow of a government
纵向
2
Ancient empire that conquered much of Europe
4
Armored warrior of medieval times
5
Belonging to a very old period
6
Long and distinct period of history
11
Fortified medieval residence
12
Government ruled by a king or queen