Across
1
Armed entry into another territory
4
Exchange of goods between peoples
6
Ancient empire that conquered much of Europe
7
Union formed for mutual benefit
8
Belonging to a very old period
Down
2
Fundamental law of a nation
3
Person with no fixed home
5
Government ruled by a king or queen
9
Deadly epidemic disease
10
Period of ten years
11
Alloy of copper and tin used in early tools
12
Long and distinct period of history