Combing two ranges with identical column structure from two different sheets (in same spreadsheet)

I’m doing a simple ticketing system, where I have two sheets, “Form Responses” and “Email Responses” both of which are populated automatically as their names imply (one from a form, one from an email by using Zapier). Both sheets have the same header columns (e.g.: Timestamp, Email Address, Subject, Description).

I want to create a third sheet that has the same headers again but has content from both “Form Responses” and “Email Responses”, sorted by Timestamp.

I tried ={'Form Responses 1'!A2:H18,'Email Responses'!A2:H18} but it puts the sheets next to each other.