I want to know the answer to the following question:
Which historian claims that even the Arabs acknowledged the importance of the Gurjara Pratihara Empire in stopping invasions?
All the background I'm provided with is that "Now there seems little doubt that it was the power of the Gurjara Pratihara army that effectively barred the progress of the Arabs beyond the confines of Sindh, their first conquest for nearly 300 years.". Is that enough to answer the question?
Answer: no