In 1859, long before the Badilla brothers or J. S. Phillips arrived on the scene, that northern section of Covina that today lies between San Bernardino Road and Arrow Highway began being settled by enterprising American and immigrant pioneers. Featured in this article is a recently discovered telling of those settlers' story that was written in 1887, when all the events described were still in the living memory of those who witnessed them.
The land which was the subject of this newfound contemporary account was originally part of Henry ("Don Enrique") Dalton's Rancho Azusa, which the Englishman had purchased from Don Luis Arenas in 1844. At that time, Dalton's ranch encompassed most of the land east of the San Gabriel River and south from the foothills of the San Gabriel Mountains to the old San Bernardino stage road.

Rancho Azusa de Dalton originally extended south to the northern boundary of Rancho La Puente. Alignments of selected section and quarter-section roads of today are labeled for reference.
Source: U.S. Dept. of the Interior, Bureau of Land Management, General Land Office Records. (Click on the image to view an enlargement.)
As the article below will recount, in 1858 the U. S. Government ordered a new survey of Dalton's holdings, the result of which was the invalidation of Rancho Azusa's southern and eastern boundaries. Surveyor Henry Hancock drew a new southern line for Dalton's rancho (today's Gladstone Street), thus creating 2,428.25* acres of new public land that thereupon became available for preemption, and later, homesteading.
While Pflueger (1964) gave an admirably thorough account of Covina's squatter era, this article from the January 23, 1887, edition of the Los Angeles Times** tells the story from a unique perspective I haven't seen in print before.