The consonantal MT text of Num. 32:38 says MWSBT $M ($=Shin). The MT vocalization is "musabot shem", a strange phrase, which is usually understood as "of changed names". The Septuagint says "perikekuklomenas", which simply means "encircled" or "surrounded", which is a possible translation of MWSBT. Your understanding of "perikekuklomenas" as "fortified" is a matter of interpretation, not what the Septuagint actually says.
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