A tent shelter of the type that is erected by at least one arch pole and has multiple fabric walls that intersect to form substantially vertical corners when the shelter is erected. At each corner a strut-and-guy line support structure is provided for supporting and tensioning the fabric walls. Each strut structure includes two strut legs, each leg being integrated with a respective wall of a particular corner. The bottom ends of the strut legs are spread apart in the erected state of the shelter but are interconnected by a flexible strap. The top ends of each set of legs converge to form an inverted V shape. A guy line arrangement tensions each of the corners. The tent body can further be strengthened against severe weather by additional arch poles removably secured to the fabric body in an X configuration crossing the center arch and passing over the corners.