What does Exodus 14:18 mean?

During this story of the exodus, God has repeatedly demonstrated incredible power. This included devastating plagues on the Egyptians (Exodus 7:21; 8:6, 17, 24; 9:6, 10, 24; 10:14, 23; 12:29–32) who had enslaved the nation of Israel (Exodus 1:8–14). Many Egyptians recognized these as signs of divine authority (Exodus 8:19; 10:7). This should have been more than enough to convince them to submit to the Lord. Yet they cooperated with enslaving Israel until the terrible death of Egyptian firstborn (Exodus 12:33). Their king was stubborn and refused to obey God's commands (Exodus 8:15, 31–32; 9:34–35; 10:19–20). Now, Pharaoh has led an army to bring Israel back into slavery (Exodus 14:5–9).

God is planning one final sign to show Egypt that He alone is sovereign (Exodus 7:5). Whether this will convince any of them to acknowledge Him as Lord, it will leave no doubt about His power. Israel will be free and separated from a thoroughly devastated Egypt by an entire sea (Exodus 14:21–27). None of the soldiers who participated in this attack will survive (Exodus 14:28). Israel, as well, will respond to this with increased faith in God (Exodus 14:31).