Materials

the materials include every kind of expendable stuff, like: diamonds, science, town blueprints, campaign medals, etc

Diamonds
the diamonds are a very useful expendable material, it is used for hiring troops, mainly seargent troops from clan shop, but it can also be used for hiring veteran troops from diplomatic center, buying rare troops from Frigate Elizabeth and buying veteran troops in the military academy

Town blueprints
The town blueprints are used for expanding your town, clicking in the forest territories and using them to clear them out, the territories go increasing in cost as you advance, it can be got by some rewards and by asking Friends for them (it wont be reducted from the friend account)

Science
The science is a very useful material, it can be used for researching technologies at the academy, and can be got as rewards or bought with gold

Contract
The contract can be used to buy premium troops from the diplomatic center and field medics from the hospital, it can be got as a reward, it can be crafted in the arsenal

Intellingence
The intelligence is used to scout enemy defenses and garrison on sieges, paying for survivals and some other uses, it can be crafted or got as a reward

Pound
The pound is used to buy materials from the workshop at the market, it can be got as a reward and from survival battles

Silver
The silver can be got from asking Friends and rewards, it can be used for buying stuff from the market in the munitions section, the silver equipment is often (but not always) low quality equipment

Campaign medals
The campaign medals can be got from the weekly events, many events will award some kind of medal that will let you buy stuff from the event shop with it, it can often be got from battles and sieges against other players