valtaus.

takeover (time or event in which control or authority changes hands, especially unwillingly over a facility)

Tukikohdan valtaus sujui ongelmitta.

conquest (that which is conquered; possession gained by force)

takeover (purchase of one company by another, especially where some stakeholders in the purchased company oppose the purchase)

vihamielinen valtaus

claim, mining claim (claim of the right to extract minerals from a tract of public, or, depending on jurisdiction, private land; the piece of land claimed)

claiming/assuming the ownership of property, especially movables but historically also land, which has no owner or has been abandoned by its owner