The online grocery delivery war is intensifying. Walmart announced today that it is expanding its delivery program this year to more than 100 markets, from six currently. The company will also expand a program that allows people to order groceries online and drive to nearby Walmart parking lots where employees load them into their cars to 1,000 more stores, for a total of 2,200 stores. Its model is similar to that of Instacart: its own “personal shoppers” will pluck items for online orders from shelves and hand them off to Uber and Deliv contractors to deliver to customers. Walmart is among many retailers attempting to find their own speedy grocery delivery solutions after Amazon’s purchase of Whole Foods. Amazon rolled out two-hour grocery delivery from Whole Foods for Prime members in six markets earlier this year. While many grocers are relying on Instacart, Walmart is trying multiple methods to compete. Its Sam’s Club division has partnered with Instacart.