Frolic-class gunvessels
... that the Royal Navy's Frolic-class gunvessels were used to suppress the slave trade between East Africa and the Persian Gulf in the 1870s and 1880s?
... that the <a href="./Royal_Navy" id="mwCI4" rel="mw:WikiLink" title="Royal Navy">Royal Navy</a>'s <b id="mwCI8"><a class="mw-redirect" href="./Frolic_class_gunvessel" id="mwCJA" rel="mw:WikiLink" title="Frolic class gunvessel"><i id="mwCJE">Frolic</i>-class gunvessels</a></b> were used to suppress the <a class="mw-redirect" href="./Slave_trade" id="mwCJI" rel="mw:WikiLink" title="Slave trade">slave trade</a> between <a href="./East_Africa" id="mwCJM" rel="mw:WikiLink" title="East Africa">East Africa</a> and the <a href="./Persian_Gulf" id="mwCJQ" rel="mw:WikiLink" title="Persian Gulf">Persian Gulf</a> in the 1870s and 1880s?