分析英语句子（英语高手进）

I should have fallen into the hands of the murderous Ghazis had it been for the devotion and courage shown by Murry, my orderly,who threw me accross a packhorse,and succeeded in bringing me safely to the British lines.
帮忙分析下句子结构,不用翻译.
答：
had it been for the devotion and courage shown by Murry是个省略了if的虚拟条件句,但是原句漏掉了否定词not,正确的句子应为：had it not been for the devotion and courage shown by Murry
=if it had not been for the devotion and courage shown by Murry
shown by Murry是过去分词短语作后置定语
my orderly是Murry的同位语
who threw me accross a packhorse,and succeeded in bringing me safely to the British lines.是定语从句修饰名词my orderly
因此这是一个带有定语从句的虚拟条件句.
主句是：
I should have fallen into the hands of the murderous Ghazis