▁the ▁oldest ▁of ▁three ▁k ids ; ▁a ▁brother ▁to ▁Harry ▁Wal lace ▁( born ▁in ▁ 1 9 1 2 ) ▁and ▁Grace ▁E ile en ▁( born ▁in ▁ 1 9 1 3 ). ▁Harry ▁and ▁Susan ▁started ▁their ▁mission ary ▁work ▁in ▁Argentina ▁from ▁their ▁marriage ▁in ▁ 1 9 0 3 ▁to ▁ 1 9 1 8 . ▁Sub sequently , ▁they ▁moved ▁to ▁Costa ▁Rica . ▁As ▁children ▁of ▁mission aries , ▁Stra chan ▁and ▁his ▁sib lings ▁were ▁often ▁left ▁with ▁trust ed ▁Christian ▁families ▁in ▁Costa ▁Rica . ▁ ▁Harry ▁and ▁Susan ▁Stra chan ▁were ▁leaders ▁of ▁the ▁Latin ▁America ▁Evangel ism ▁Camp aign . ▁The ▁Stra chan ▁family ▁spent ▁many ▁of ▁their ▁early ▁years ▁in ▁Costa ▁Rica . ▁Harry ▁went ▁on ▁many ▁miss ions ▁tri ps ▁around ▁the ▁area ▁to ▁evangel ize ▁and ▁convert ▁loc als ▁into ▁Christian ity . ▁Meanwhile , ▁Susan ▁played ▁her ▁own ▁independent ▁role ▁in ▁the ▁campaign ▁by ▁initi ating ▁the ▁found ing ▁of ▁a ▁girls ’ ▁school ▁in ▁Costa ▁Rica ▁and ▁sust aining ▁a ▁small ▁farm ▁to ▁contribute ▁to ▁the ▁mission ▁through ▁food ▁prov isions . ▁ ▁At ▁age ▁fifteen , ▁Stra chan ▁was ▁sent ▁to ▁the ▁United ▁States ▁and ▁was ▁immediately ▁en rolled ▁into ▁the ▁Whe aton ▁Academy ▁in ▁Illinois ▁to ▁complete ▁his ▁secondary ▁education . ▁Through out ▁this ▁period , ▁his ▁week ly ▁exchange ▁of ▁letters ▁with ▁his ▁mother ▁port ray ▁his ▁difficult ▁transition ▁into ▁American ▁society . ▁In ▁addition , ▁Stra chan ▁end ured ▁much ▁financial ▁difficulty