Final answer:
The four promises made between Milly and Annie are not directly detailed within the text provided. However, comparing similar themes of pledges and promises in the given excerpts, we can infer that these promises likely involve a deep commitment involving spiritual beliefs, love and loyalty, mutual well-being, and maintaining honor.
Step-by-step explanation:
The four promises Milly and Annie made to each other can be deduced from several extracts but are not explicitly stated in the text. Analyzing similar themes of pledges and promises from the passages, we can infer that the promises may span a commitment comprising spiritual beliefs, love and loyalty, dedication to each other's wellbeing, and maintaining honor in the face of adversity.
For instance, the reference to pledging lives, fortunes, and sacred honor reflects a deep commitment to each other's wholehearted support through various life circumstances. A similar pledge of 'protection of divine Providence' echoes the spiritual or religious commitment often found in marital or deep platonic relationships.
Yet, it is essential to note that without direct quotes or more context about Milly and Annie's specific promises, we must rely on the thematic connections within the broader text to surmise the nature of their pledges to one another.