Across
1
Metal that replaced bronze in tools
3
Military blockade of a fortified place
5
Medieval land-for-service system
6
Armed entry into another territory
7
Payment made to show submission
8
Object made by humans from the past
10
Alloy of copper and tin used in early tools
11
Practice of establishing foreign colonies
12
Belonging to a very old period
13
Formal agreement between nations
Down
2
Union formed for mutual benefit
3
Legislative body in ancient Rome
4
Legislative assembly of a country
9
Fortified medieval residence