What made Santiago V. Alvarez credible for those pieces of information that he provided in his memoirs?

To answer this question, we need to consider several factors that contribute to Santiago V. Alvarez's credibility in his memoirs:

1. Personal Experience: Alvarez was a key figure in the Philippine Revolution and the Philippine-American War. His firsthand experiences and direct involvement in these historical events provide a unique and personal perspective, making his accounts valuable and credible.

2. Detailed Documentation: Alvarez's memoirs are known for their detailed descriptions and meticulous documentation of events, people, and places. This level of detail not only makes his work engaging but also adds to its credibility.

3. Corroboration: The events and experiences Alvarez describes in his memoirs can be corroborated with other historical records and accounts from the same period. This cross-verification further enhances his credibility.

4. Reputation: Alvarez was a respected figure in his time. His reputation and standing in society also lend credibility to his memoirs.

5. Objectivity: Despite being personally involved in the events he describes, Alvarez is known for his objectivity and fairness in presenting different sides of the story. This balanced approach adds to his credibility as a reliable source of information.

6. Peer Review: Alvarez's memoirs have been studied and reviewed by historians and scholars, further attesting to their credibility.

In conclusion, Santiago V. Alvarez's credibility in his memoirs is established through his personal experiences, detailed documentation, corroboration with other sources, reputation, objectivity, and peer review.