Why one ironclad could deter a squadron

Japan sought an ironclad because most overseas cruisers, sloops, corvettes, and frigates lacked armour. A vessel with comparable guns and armour could overmatch the ships normally used for distant presence duties. Sending a single opponent such as HMS Warrior would still be a reputational gamble if it failed, while several ironclads would be costly and conspicuous. A still larger force might compel submission without battle, but its deployment would advertise how much effort a major power needed to overawe Japan. This period-specific risk-fleet logic depended on a technological mismatch instead of a simple numerical ratio. The United States was the awkward exception: it was growing powerful but did not yet bear the same reputational burden, so status-based deterrence constrained it less.