This book (https://books.google.com.au/books?id=7ULWRnskfr4C&pg=PA61&lpg=PA61&dq=white+armies+russian+civil+war+2.4+million&source=bl&ots=k2eL4H7i8n&sig=_WIgItvN1UFXkBv-wqORYSOgmFw&hl=en&sa=X&ved=0ahUKEwi44-_g_Z7XAhWHHJQKHZVXCrsQ6AEIXDAJ#v=onepage&q=peak%20size&f=false), of dubious reliability due to its underrepresentation of the Red Army, claims 1 million White soldiers at their peak. There are similar concerns about this book (https://books.google.com.au/books?id=rvM_CgAAQBAJ&pg=PT25&lpg=PT25&dq=white+armies+russian+civil+war+2.4+million&source=bl&ots=FPHjW5D4qc&sig=b0XMoiBTgYtyr2aguDL9BS-mvNI&hl=en&sa=X&ved=0ahUKEwi44-_g_Z7XAhWHHJQKHZVXCrsQ6AEISTAF#v=onepage&q=white%20armies%20russian%20civil%20war%202.4%20million&f=false), but it corroborates the figure of 2.4 million.

This book, of dubious reliability due to its underrepresentation of the Red Army, claims 1 million White soldiers at their peak. There are similar concerns about this book, but it corroborates the figure of 2.4 million.