 Some sort of armed occupation was a real possibility ,The UK had occupied Iceland in May 1940  but the balance of evidence is that there was never a serious threat.
<fluency>  Some sort of armed occupation was a real possibility ,The UK had occupied Iceland in May 1940  but the balance of evidence is that there was never a serious threat.
 Some sort of armed occupation was a real possibility ,The UK had occupied Iceland in May 1940 ), but the balance of evidence is that there was never a serious threat.